5. Notice that
if selector
switch
is turned
I
to MARIMBA or XYLOPHONE
posi-
!
tions,
a
reiterative
sound
of
different
^
quality
is
heard. The two
harmonics
used in these voices are turned on and
off
at
opposite times.
This
is known as
"alternate reiteration",
d. Cymbal-Brush Switch
Operation
1^
1
.
With
lower manual
DRAWBARS
tab
switch depressed,
and CYMBAL-
BRUSH
switch
off,
lower manual
t
drawbars should function normally.
I
2. With CYMBAL-BRUSH
switch to any
on-position,
drawbar
#7
will be
inoperative.
I
3. With lower manual
DRAWBAR
tab
I
up,
and
Brush
&
Cymbal
switch
in
LOUD
position,
depress
BRILLIANCE
tab,
playing
any lower manual
key
repeatedly
(other than highest 6 keys
i
on right-
side
of
manuals). The
result
should be a
percussive
hiss sound
of
1.0
V
±
3 db rms measured
across
12"
speaker
leads. R602
may be
adjusted to
obtain the proper
levels.
R602
is located on
terminal strip
assembly,
AO—3
1213—1.
4.
With
Cymbal and Brush
switch
in
LOUD position,
play
any pedal
repeat-
edly,
and
notice
percussive
hiss
sound
of 1.25
V±3db rms.
5.
Notice
that
when BRILLANCE fab is
.
turned
off,
volume
of
Brush and Cym-
r
bal is decreased.
d.
Press
BRUSH push button
at
about
5
times per second.
Adjust R
126
to ob-
tain
a meter indication of 2.2 to 2.8
V
rms.
e. Press
TOM-TOM push button at about
5 times per second.
Adjust
R
134 to
ob-
tain
a
meter
indication of 1.3 to
1.7
V
rms.
4-9.
ONE VOICE
IS SILENT.
-
Check
the
following:
a.
Connection
to corresponding pin of
PWB,
124-0001
14,
See
Figure
5-6.
b.
If
connections
O.K,, check for
+15
V
DC
at
pin when
push
button of missing voice
is
held
down.
c.
If voltage is
missing,
check connections
to
push button
switch,
rocker
tab, and
rhythm power
supply.
d.
If
voltage
is
present,
trace
associated
voice
circuitry.
NOTE
If
failure
is in
Brush and/or
Cymbal voice,
check
Q
1
0
1
.
4-10.
PROGRAMMED
VOICE
DOES
NOT
SPEAK.
-
If any
voice speaks
when push
button
is
pressed,
but not from
programmed source
(manual or pedal, as
appUcable), check
rocker
switch
and associated wiring.
See
Paragraphs
4—
1
3 and
4—14
also.
4-7.
L-100-1 SIX-VOICE
PERCUSSION PERFORM-
ANCE CHECK AND
TROUBLESHOOTING.
4-8.
OUTPUT LEVEL
ADJUSTMENTS!.-
The
rhythm volume levels are
set
at the
factory,
and
will
normally require
no adjustment.
In
case
it
is found necessary
to
replace
a part
on the
rhythm board,
124-0001
14,
adjust-
ment will
be required.
To
adjust output
levels,
proceed
according to
the
following.
A VTVM,
Millivolt Commander,
Model
870,
or
equivalent is required.
See Figure
5—6
for
locations
of
controls.
a.
Set all
tabs
and rocker
sv/itches
to "up"
or "off
positions.
Set swell pedal and
'f
RHYTHM
VOLUME
control
to maxi-
mum output.
b.
Connect
VTVM
across
main
speaker
leads.
e.
Press
CYMBAL
push
button at about
5
p
times
per second.
Adjust
Rl
13 to
obtain
a meter
indication
of
2.2
to 2.8
V
rms.
4-11.
ALL PERCUSSIVE
VOICES SILENT.
-
(Hiss
voices
speak.) Check
Q107,
Q108,
and
associated circuitry.
4-12.
BOTH
HISS
VOICES
SILENT
-
(Percussive
Voices Speak.) Check
Q106
and associated
circuitry. Check
Q
1
0
1
.
4-13.
NO
VOICE RESPONSE FROM PEDALS.
-
Check
pedal
keying pulse
circuits.
Para-
graph
2—19.
4-14.
NO VOICE RESPONSE FROM
MANUAL.
-
Check manual
keying
pulse
circuits.
Para-
graph
2—18.
4-15.
NO
PERCUSSION
OUTPUT.
-
Check con-
nections to percussion power supply.
Check
power supply
outputs.
^
4-16.
TROUBLESHOOTING.
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